I been into watchin UFC and MMA for about a year and a half now. I been boxing once a week for about 5 months now. Awesome workout. I was thinkin about eventually studyin and takin a martial arts class. Anyone got any suggestion as to which particular fight style and why?

Depends on what you like. If you like MMA then train in that. The only downfall to training in MMA is if you don't want to actually compete then you won't get the full training. Most likely it will be a cardio session. If you only like the stricking aspect then hit up some muay thai..or if you like the submission side..then BJJ.